Github user zhongneu commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/713#issuecomment-185586523 I've refactored the variable parsing form a little bit to make the parsing/substation logic consistent, as well as added some unit tests for input parsing. The checkbox form now can support custom delimiter using syntax like: `${checkbox( or ):mycheck=a|b,a|b|c}` This example will be expanded to `a or b`. See the updated screenshots for demo
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